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HL: Fachverband Halbleiterphysik

HL 16: Focus Session: Quantum Emitters in 2D Semiconductors

HL 16.6: Vortrag

Dienstag, 10. März 2026, 12:15–12:30, POT/0081

Nanoscale magnetic field sensing with spin defects in hexagonal boron nitride — •Korbinian Felber, Timo Strobl, Paul Konrad, Andreas Sperlich, and Vladimir Dyakonov — Experimental Physics 6, Julius-Maximilians-Universität Würzburg (JMU), 97074 Würzburg, Germany

The development of quantum sensors based on solid-state spin defects is a vibrant research area, yet most host materials are three-dimensional, making it challenging to position the sensing spins in close proximity to a target sample. This limitation was recently overcome in 2020 with the discovery of the negatively charged boron vacancy (V_B⁻) in the two-dimensional van der Waals material hexagonal boron nitride (hBN). Exfoliating spin-active hBN flakes provide coherent spin manipulation in an atomically thin host. Using optically detected magnetic resonance (ODMR), these hBN spin defects provide sensitive readout of local magnetic fields, temperature, and strain, making functional hBN layers an ideal platform for exploring fundamental questions in 2D magnetism. In this study, we assemble a vdW heterostructure by stacking active hBN on top of a 2D ferromagnet. By employing spin-relaxometry techniques, we probe nanoscale magnetic fluctuations near the Curie temperature of the exfoliated ferromagnet. Our results highlight the potential of hBN-based quantum sensors for characterizing local magnetic properties in vdW heterostructures, offering substantial benefits for the design of next-generation 2D devices.

Keywords: Quantum sensor; hBN; vdW-heterostructure; 2D magnetism; negatively charged boron vacancy